Statement by Islamic State included a photo of a masked man wearing what appeared to be an explosive vest

Islamic State has claimed responsibility for the fatal attack on a bus carrying members of the Tunisian presidential guard on Tuesday.

In a statement posted on social media on Wednesday, Islamic State identified the bomber by the nickname Abu Abdullah Al Tunsi, or Abu Abdullah the Tunisian. The attack on the bus killed 12 people as it was traveling through the capital Tunis.